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An achondrite is a stony meteorite that does not contain chondrules. It consists of material similar to terrestrial basalts or plutonic rocks and has been differentiated and reprocessed to a lesser or greater degree due to melting and recrystallization on or within meteorite parent bodies.
A chondrite / ˈkɒndraɪt / is a stony (non- metallic) meteorite that has not been modified, by either melting or differentiation of the parent body. [a] [1] They are formed when various types of dust and small grains in the early Solar System accreted to form primitive asteroids.
- Small to medium asteroids that were never part of a body large enough to undergo melting and planetary differentiation.
- Over 27,000
- 3–6
- Stony
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Chondrites are physically and chemically the most primitive meteorites in the solar system. They appear to be primarily aggregates of material that formed in the solar nebula prior to or during planet formation. They also contain some material that predates formation of the solar system.
- The Editors of Encyclopaedia Britannica
Home Science Astronomy. Achondrites. Johnstown meteorite. Sawed and polished section of a fragment of the Johnstown meteorite, an achondrite that was seen to fall July 6, 1924, in Colorado. The meteorite, classified as a diogenite, contains large orthopyroxene grains in a matrix of crushed and broken (brecciated) orthopyroxene. (more)
Because achondrites closely resemble terrestrial rocks to the naked eye, they are less commmonly encountered as finds. The achondrites include. lunar meteorites; martian meteorites; HED meteorites; primitive achondrites; For detailed information on achondrites and their classification, click here.
Achondrite They are achondrites that exhibit igneous textures or igneous textures modified by impact and/or thermal metamorphism, and that have compositions of lithophile, siderophile, chalcophile, and atmophile elements that are highly fractionated from the ranges of chondritic materials.
